Rigol DHO900 User Manual page 66

Acquisition System
When you select "Average" mode, click or tap the Averages input field to set the
number of averages with the pop-up numeric keypad or use the corresponding
multipurpose knob to set the value. Its range is from 2 to 65536, and the default is 2.
NOTE
The number of averages must be the Nth power of 2. When it is not in N power-of-2
increments, a prompt message "Truncation average error" is displayed. At this time, a value
that is smaller than the one you input and the closest to N power-of-2 increments will be input
automatically.
Peak
In this mode, the oscilloscope acquires the maximum and minimum values of the
signal within the acquisition interval to get the signal envelope or capture narrow
pulses that might be lost. This mode prevents signal aliasing at the expense of
exaggerating the noise.
In this mode, the minimum pulse width detected is the sample period.
UltraAcquire
UltraAcquire mode is one of the fast acquisition modes. It divides the oscilloscope's
memory into segments and fills a memory segment for each individual trigger event.
It provides a much higher waveform capture rate and helps minimize the dead time
between trigger events.
When you select "UltraAcquire" mode, click or tap the Display Frame input field to
set the number of frames and the Timeout input field to set the timeout. When the
number of the frames reaches the maximum or the sampling time reaches the
timeout, the oscilloscope stops sampling and plots the waveform. Click or tap the
Display mode drop-down button to select the display mode of the acquired data.
•
Adjacent: Waveform segments are shown in an adjacent way with each segment
shown next to the previous segment in time order. A maximum of 100 frames
can be displayed on the screen at a time in this mode.
• Overlay: All the captured waveform segments are overwritten to display as one
single segment of the waveform. A maximum of 100 frames can be displayed on
the screen at a time in this mode.
• Waterfall: It displays the captured waveform segments in a cascaded display
order. A maximum of 100 frames can be displayed on the screen at a time in this
mode.
• Perspective: The waveform segments are displayed in the ladder-like form, with
each segment being arranged above another with a certain perspective (angle),
moving up like a rising slope. A maximum of 100 frames can be displayed on the
screen at a time in this mode.
DHO800 User Guide
52
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